Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994rsci...65.1833e&link_type=abstract
Review of Scientific Instruments (ISSN 0034-6748), vol. 65, no. 6, p. 1833-1838
Astronomy and Astrophysics
Astronomy
13
Electromagnetic Noise, Heterodyning, Josephson Junctions, Noise Temperature, Radio Astronomy, Radio Receivers, Sis (Superconductors), Submillimeter Waves, Aluminum Oxides, Electromagnets, Inductance, Niobium, Shot Noise, Signal To Noise Ratios
Scientific paper
The design and performance of a 492 GHz quasioptical superconductor - insulator - superconductor (SIS) heterodyne receiver with sensitivity as good as those of the best waveguide receivers presently operating at this frequency were presented. In this assembly, an integral twin-slot planar antenna was matched to a pair of SIS junctions linked by an inductance. The consequences of this investigation showed that quasioptical receivers can be fabricated with conversion losses and noise temperatures comparable to current ones. Scans across the dewar aperture with a blackbody source indicated a main beam of f/15. Heterodyne tests revealed a DSB noise temperature of 170 K. Combined measurements of shot noise from the unpumped mixer, these results suggested a conversion loss of 5.4 dB, a mixer temperature of 128 K, and an i.f. chain noise temperature of 12 K.
Engargiola Greg
Lo Kwok Yung
Zmuidzinas Jonas
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